Ionia Weather Forecast
- 54
- 76
Becoming Sunny
- 57
- 81
Partly Sunny
- 43
- 67
Mostly Sunny
- 49
- 69
Mostly Sunny
- 61
- 80
Partly Sunny
- 63
- 83
Slight Chance Thunderstorms
Today 17 Sep Ontario
Partly to mostly sunny. Highs in the upper 70s. Light east Winds.
Tonight 17 Sep Ontario
Mainly clear with some patchy fog developing overnight. Lows in the mid 50s. Light Winds.
Ionia Temperature Statistics
September Temperature
Rochester, Greater Rochester International Airport (15.5 miles)
Lowest 8 September, 2025
43 °FAverage September
62.2 °FHighest 3 September, 2025
81 °F
Climate (2020–Present)
Rochester, Greater Rochester International Airport (15.5 miles)
Average Low 2020–2025
42.6 °FAverage 2020–2025
51 °FAverage High 2020–2025
59.6 °F